Former CIA Director John BrennanJohn Owen BrennanAfter Dems stood against Pompeo, Senate’s confirmation process needs a revamp Ratings show Comey buzz is all hype Brennan confirms he has not been interviewed by Mueller MORE on Friday went after President TrumpDonald John TrumpRand's reversal advances Pompeo New allegations could threaten Trump VA pick: reports President Trump puts on the pageantry for Macron’s visit MORE over his attacks on former FBI Director James ComeyJames Brien ComeyFlight records show Trump spent night in Russia, contradicting what he told Comey: report White House stresses Trump has 'no intention' of firing Mueller Bad news for the GOP: 'Comey memos' leak is 'Nunes memo' redux MORE, tweeting that Trump’s “kakistocracy is collapsing after its lamentable journey.”

“As the greatest Nation history has known, we have the opportunity to emerge from this nightmare stronger & more committed to ensuring a better life for all Americans, including those you have so tragically deceived,” Brennan tweeted at Trump.

A kakistocracy is a form of government in which the worst persons are in power.

Brennan has been a regular critic of Trump, warning last month that lawmakers who protect him will face "a reckoning."

If anything, his criticisms have become more pronounced in the last few months. 

Trump lashed out at Comey in a pair of tweets early Friday, calling him a “leaker & liar” and an “untruthful slime ball.” 

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The attack came after multiple media outlets reported on excerpts of Comey’s upcoming book.

Comey writes in the book that Trump had asked him to probe the infamous “pee tape” mentioned in the so-called Steele dossier in order to disprove its existence. The dossier alleges that Trump hired prostitutes to urinate on a bed used by former President Obama and first lady Michelle ObamaMichelle LeVaughn Robinson ObamaGeorge H.W. Bush in intensive care Michelle Obama congratulates duke and duchess of Cambridge on royal baby ‘Morning Joe’ host: Trump tweeting during Barbara Bush funeral ‘insulting’ to US MORE at the Moscow Ritz-Carlton.

Comey also ripped Trump as "untethered to truth" in the book and compared him to a mob boss.

“A Higher Loyalty: Truth, Lies, and Leadership” comes out Tuesday.